YOU SAID:

Complaint investigation is underway.

INTO JAPANESE

苦情調査は進行中です。

BACK INTO ENGLISH

Complaint investigation is in progress.

INTO JAPANESE

苦情調査は進行中であります。

BACK INTO ENGLISH

Complaint investigations are in progress.

INTO JAPANESE

苦情調査が進行中です。

BACK INTO ENGLISH

Complaint investigation is in progress.

INTO JAPANESE

苦情調査は進行中であります。

BACK INTO ENGLISH

Complaint investigations are in progress.

INTO JAPANESE

苦情調査が進行中です。